应优先选择（）物质开展物质人为流动分析 When carrying out a material

单项选择题

应优先选择（）物质开展物质人为流动分析 When carrying out a material anthropogenic flow analysis, priority should be given to （）

A、人类用量保持不变的物质 The material whose uses by human beings remains constant
B、人类用量增长较慢的物质 The material that has a slower increase in human consumption
C、人类用量增长较快的物质 The material that had a rapid increase in human consumption
D、以上都不对 None of the above